They exist in case we ever make contact
with an ALIEN civilization.
The Big Bang Theory Season 9, Episode 10
I'm even on some
ALIEN conspiracy blog.
The Big Bang Theory Season 12, Episode 20
He was only pretending to be scared to trick the ALIEN king.
The Big Bang Theory Season 12, Episode 18
...and glued a big-eyed rubber ALIEN mask
to the outside of my window.
The Big Bang Theory Season 6, Episode 2
My point is, pretending to be an ALIEN
is a valuable coping mechanism...
The Big Bang Theory Season 8, Episode 8